Bioptigen Press Release - Devices become first OCT systems cleared for hand-held ophthalmic imaging of children Bioptigen Inc. has received 510(k) clearance from the U.S. Food and Drug Administration to begin marketing its hand-held Envisu Spectral Domain Ophthalmic Imaging System (SDOIS) devices for patient use. The Envisu SDOIS aids in the diagnosis of physiological and pathological conditions of the eye through non-contact optical imaging. In receiving this regulatory clearance, Bioptigen’s Envisu SDOIS become the first optical coherence tomography imaging systems commercially available in the United States for hand-held and pediatric imaging. Envisu’s ergonomic, hand-held scanner enables imaging ...

Chronic rhinosinusitis with nasal polyposis (CRSwNP) is a multifactorial disease that seems to be associated with the presence of microbial biofilms and corresponding subepithelial inflammatory reactions. Optical coherence tomography (OCT) might be applied to detect bacterial and fungal biofilms in patients with CRSwNP. A total of 27 patients with CRSwNP undergoing endoscopic sinus surgery (ESS) were analyzed. The negative control group consisted of six patients undergoing septoplasty for nasal obstruction without CRSwNP. The nasal polyps and inferior turbinate mucosa specimens applied as negative controls were processed to OCT analysis and H.E. and Gram staining. Biofilm was detected in 22 ...

Aims: To demonstrate the feasibility and potential usefulness of an offline fusion of matched optical coherence tomography (OCT) and intravascular ultrasound (IVUS)/virtual histology (IVUS-VH) images.

Ninepoint Medical Press Release - NinePoint Medical, Inc., an emerging leader in the development of medical devices for in vivo pathology, today announced that the company will preview its next-generation optical imaging technology, the NvisionVLE™ Imaging System, at Digestive Disease Week 2012 (DDW 2012), being held May 19 to 22 at the San Diego Convention Center in San Diego. NinePoint Medical will provide public demonstrations of the NvisionVLE Imaging System, which is designed to bridge the gap between diagnosis and disease treatment by enabling physicians and pathologists to evaluate high-resolution, volumetric images of organs and tissues in real time. “We are ...

Mouse models of ocular diseases provide a powerful resource for exploration of molecular regulation of eye development and pre-clinical studies. Availability of a live high-resolution imaging method for mouse embryonic eyes would significantly enhance longitudinal analyses and high-throughput morphological screening. We demonstrate that optical coherence tomography (OCT) can be used for live embryonic ocular imaging throughout gestation. At all studied stages, the whole eye is within the imaging distance of the system and there is a good optical contrast between the structures. We also performed OCT eye imaging in the embryonic retinoblastoma mouse model Pax6-SV40 T-antigen, which spontaneously forms lens ...

Developed specifically for the iPad, The Clinical Atlas of OCT offers a rapid and interactive guidance to a systematic and scientifically critical interpretation of OCT images for interventional cardiologists, pathologists, and other physicians, technicians, trainees and research staff.  See screenshots by clicking HERE. Led by Professor Patrick W. Serruys, Dr. Maria Radu, Dr. Lorenz Räber and Dr. Hector Garcia-Garcia, the team behind this publication includes several international well-renowned experts and key opinion leaders within the field of intracoronary imaging and pathology. The Clinical Atlas of Intravascular OCT comprises eight separate chapters offering the following contents: 1. Principles of OCT 2 ...

Objective To demonstrate the feasibility of imaging human coronary atherosclerosis using a novel hybrid intravascular ultrasound (IVUS) and optical coherence tomography (OCT) imaging catheter. Background IVUS and OCT have synergistic advantages and recent studies involving both modalities suggest the use of a hybrid imaging catheter may offer improved guidance of coronary interventions and plaque characterization. Methods A 1.3 m custom hybrid IVUS-OCT imaging probe was built within a 4F catheter using a 42 MHz ultrasound transducer and an OCT imaging fiber. Coplanar images were simultaneously acquired ex vivo by both modalities in 31 arterial segments from 11 cadaveric human ...

The project, entitled ‘Novel optical techniques for enhanced structural, functional and dynamical imaging of anterior and posterior segments of the eye’ consists of two independent parts: The objective of the first part of the project is to broaden knowledge about the dynamic optical processes in the human retina especially these based on auto-fluorescence of retinal tissue, to develop novel ultrahigh resolution, optical imaging modality for visualization of morphology and function of the human retina. The objective of the second part of the project is to develop new, high performance imaging technology , that will have widespread research and clinical applications, to ...

The project,entitled‘Novel optical techniques forenhanced structural, functional and dynamical imaging of anterior and posteriorsegments of the eye’consistsof two independent parts:Theobjective of the first part of the projectis to broaden knowledge about the dynamic optical processes in the human retinaespecially these based on auto-fluorescence of retinal tissue, to develop novelultrahigh resolution, optical imaging modality for visualization of morphologyand function of the human retina. The objective of the second part of the project is to develop new, high performance imaging technology, that will have widespread research andclinical applications, to elucidate changes in morphology andbiomechanical properties of the anterior ...

The Massachusetts General Hospital received a $464,845 2012 NIH grant to develop a preclinical optical frequency domain angiography instrument. The principal Investigator is Benjamin Vakoc. This grant is part of a multi-year project that started in 2012 and ends in 2017. Below is a summary of the work. Tumor-induced angiogenesis plays a central role in the progression of tumors to malignancy, provides the critical transport of blood-born therapies into the tumor space, and supplies oxygen to effectuate oxygen-dependent radiological and light-based therapies. Pre-clinical research in tumor angiogenesis and tumor microvascular function has traditionally relied on histological methods, which suffer ...

The University of Iowa won a $526,947 2012 NIH grant to study retinal therapy guided by 3-D Optical Coherence Tomography analysis. The principal Investigator is Milan Sonka. This grant is part of a multi-year project that started in 2010 and ends in 2012. Below is a summary of the work. Age related macular degeneration (AMD) is one of the primary causes of blindness in the U.S. A wealth of powerful new treatments, especially anti-VEGF agents, have recently become available to restore visual function in choroidal neovascularization (CNV), the most severe form of AMD. The risk of ocular adverse ...

We present a comparison of corneal biometric values from dense volumetric spectral domain optical coherence tomography (SDOCT) scans to reference values in both phantoms and clinical subjects. We also present a new optically based “keratometric equivalent power” formula for SDOCT that eliminates previously described discrepancies between corneal power form SDOCT and existing clinical modalities. Phantom objects of varying radii of curvature and corneas of normal subjects were imaged with a clinical SDOCT system. The optically corrected three-dimensional surfaces were used to recover radii of curvature and power as appropriate. These were then compared to the manufacturer’s reference values in ...

We are developing a wide wavelength-swept fiber laser based on a dispersion tuning method for application to swept-source optical coherence tomography (SS-OCT) imaging. The tuning range of the laser is about 140 nm and the output power is 8 mW on average. We successfully obtained the in vivo OCT picture of the human skin at 1-kHz sweep rate.

A fast imaging system that can reveal internal sample structures is important for research and quality controls of seeds. Optical coherence tomography (OCT) is a non-invasive optical imaging technique that can acquire high speed, high resolution depth-resolved images in scattering samples. It has found numerous applications in studying various biological tissues and other materials in vivo. A few studies have reported the use of OCT in studying seed morphology. However, 3D imaging of internal seed structure has not been reported before. In this study, we used a frequency domain OCT system to image tomato seeds. The system has a central ...

We report on a novel scheme for extending the depth of focus (DOF) of ultrathin (125 μm diameter) fiber probes for optical coherence tomography (OCT) using a simple phase mask consisting of graded-index (GRIN) fiber. The technique is compatible with existing all-in-fiber probe fabrication techniques, and our simulations show that it can provide a DOF gain of ∼2 at a modest ∼5  dB reduction of peak sensitivity. In a prototype device using commercially available GRIN fiber, a DOF gain of 1.55 is obtained, validated by beam profiling and OCT imaging.

We present spectral domain polarization-sensitive optical coherence tomography (SD PS-OCT) imaging of peripheral nerves. Structural and polarization-sensitive OCT imaging of uninjured rat sciatic nerves was evaluated both qualitatively and quantitatively. OCT and its functional extension, PS-OCT, were used to image sciatic nerve structure with clear delineation of the nerve boundaries to muscle and adipose tissues. A long-known optical effect, bands of Fontana, was also observed. Postprocessing analysis of these images provided significant quantitative information, such as epineurium thickness, estimates of extinction coefficient and birefringence of nerve and muscle tissue, frequency of bands of Fontana at different stretch levels of nerve ...

Abstract  Optical coherence tomography (OCT) is a novel intravascular imaging modality using near-infrared light. By OCT it is possible to obtain high-resolution cross-sectional images of the vascular wall structure and assess the acute and long-term effects of percutaneous coronary intervention. For the time being OCT has been mainly used in research providing new insights into the pathophysiology of the atheromatic plaque and of the vascular response to stenting, however, it seems that there is potential for clinical application of OCT in various fields, such as pre-interventional evaluation of coronary arteries, procedural guidance in coronary interventions, and follow-up assessment of vascular ...

Carotid angioplasty and stenting is a minimally invasive endovascular procedure that may benefit from in vivo high resolution imaging for monitoring the physical placement of the stent and potential complications. The purpose of this pilot study was to evaluate the ability of optical coherence tomography to construct high resolution 2D and 3D images of stenting in porcine carotid artery. Four Yorkshire pigs were anaesthetized and catheterized. A state-of-the-art optical coherence tomography (OCT) system and an automated injector were used to obtain both healthy and stented porcine carotid artery images. Data obtained were then processed for visualization. The state-of-the-art OCT system ...

High speed Optical Coherence Tomography (OCT) has made it possible to rapidly capture densely sampled 3D volume data. One key application is the acquisition of high quality in vivo volumetric data sets of the human retina. Since the volume is acquired in a few seconds, eye movement during the scan process leads to distortion, which limits the accuracy of quantitative measurements using 3D OCT data. In this paper, we present a novel software based method to correct motion artifacts in OCT raster scans. Motion compensation is performed retrospectively using image registration algorithms on the OCT data sets themselves. Multiple, successively ...

Optical coherence tomography (OCT) in the 1060nm range is interesting for in vivo imaging of the human posterior eye segment (retina, choroid, sclera), as it permits a long penetration depth. Complementary to structural images, polarization-sensitive OCT (PS-OCT) images visualize birefringent, polarization-maintaining or depolarizing areas within the sample. This information can be used to distinguish retinal layers and structures with different polarization properties. High imaging speed is crucial for imaging ocular structures in vivo in order to minimize motion artifacts while acquiring sufficiently large datasets. Here, we demonstrate PS-OCT imaging at 350 kHz A-scan rate using a two-channel PS-OCT system in ...

We present the use of sub-micron resolution optical coherence tomography (OCT) in quality inspection for printed electronics. The device used in the study is based on a supercontinuum light source, Michelson interferometer and high-speed spectrometer. The spectrometer in the presented spectral-domain optical coherence tomography setup (SD-OCT) is centered at 600 nm and covers a 400 nm wide spectral region ranging from 400 nm to 800 nm. Spectra were acquired at a continuous rate of 140,000 per second. The full width at half maximum of the point spread function obtained from a Parylene C sample was 0:98 m. In ...

Background  Optical coherence tomography (OCT) allows real-time, in vivo examination of basal cell carcinoma (BCC). A new high definition OCT with high lateral and axial resolution in a horizontal (en-face) and vertical (slice) imaging mode offers additional information in the diagnosis of BCC and may potentially replace invasive diagnostic biopsies. Objectives  To define the characteristic morphologic features of BCC by using high definition optical coherence tomography (HD-OCT) compared to conventional histology. Methods  A total of 22 BCCs were examined preoperatively by HD-OCT in the en-face and slice imaging mode and characteristic features were evaluated in comparison to the histopathological findings ...

A revolution in medical diagnostics and treatment has often been proclaimed because of recent advances like genetic screening and “lab-on-a-chip” technology. But this revolution, often referred to as personalized medicine, won’t take place without a new generation of diagnostic devices that fundamentally change the way diseases are detected and treated. And that technology is being developed, put into clinical trials, and in some cases commercialized by Beckman Institute researchers in work that could contribute to a truly different experience for patients in the near future. Some of this technology includes electronic biosensor monitors that conform to skin or the ...

Advances in optical imaging modalities, such as optical coherence tomography (OCT), enable us to observe tissue microstructure at high resolution and in real time. Currently, core-needle biopsies are guided by external imaging modalities such as ultrasound imaging and x-ray computed tomography (CT) for breast and lung masses, respectively. These image-guided procedures are frequently limited by spatial resolution when using ultrasound imaging, or by temporal resolution (rapid real-time feedback capabilities) when using x-ray CT. One feasible approach is to perform OCT within small gauge needles to optically image tissue microstructure. However, to date, no system or core-needle device has been developed ...